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The T-adapter can work in two different length configurations, one suitable for the nominal f/10 backfocus of 133.35mm, and a shorter configuration for the nominal 105mm backfocus of the Celestron f/7 focal reducer.
CCD cameras can also be accommodating using T-thread spacers to make up the difference in backfocus between a DSLR and CCD. Contact Starizona for help choosing the right spacers for your setup.